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A143875 Number of ways of placing kings with no more than 2 mutual attacks on an n X n chessboard. 4
1, 2, 11, 155, 3280, 124511, 7623993, 795923016, 140176308483, 42642616703815 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..9.

CROSSREFS

Cf. A143870, A143881, A143886.

Cf. A143876, A143877, A143878, A143879, A143880.

Sequence in context: A227328 A287149 A188684 * A245054 A058154 A275923

Adjacent sequences:  A143872 A143873 A143874 * A143876 A143877 A143878

KEYWORD

nonn,more,hard

AUTHOR

R. H. Hardin, Sep 04 2008

STATUS

approved

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Last modified May 30 14:19 EDT 2020. Contains 334724 sequences. (Running on oeis4.)